It -can- help, with a good counsellor and a couple that do want to fix things. More often, though, one or both of those conditions doesn't apply.
But we got counselling 2 years into our marriage, and we've had our 25th wedding anniversary recently, so yeah it can work.
SW-User
It can only help if you are both committed and willing to do what it takes to make things work. Most wait too long to go and/or one partner is unwilling to do their part .. which is usually part of the problem in the first place.